1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
2 *@ Handling of pipes, child processes, temporary files, file enwrapping.
4 * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
5 * Copyright (c) 2012 - 2018 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
8 * Copyright (c) 1980, 1993
9 * The Regents of the University of California. All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #ifndef HAVE_AMALGAMATION
56 FP_MASK
= (1u<<7) - 1,
57 /* TODO FP_UNLINK: should be in a separated process so that unlinking
58 * TODO the temporary "garbage" is "safe"(r than it is like that) */
66 struct termios
*fp_tios
;
67 n_sighdl_t fp_osigint
; /* Only if FP_TERMIOS */
78 static struct fp
*fp_head
;
79 static struct child
*_popen_child
;
81 /* TODO Rather temporary: deal with job control with FD_PASS */
82 static struct termios a_popen_tios
;
83 static sighandler_type a_popen_otstp
, a_popen_ottin
, a_popen_ottou
;
84 static volatile int a_popen_hadsig
;
86 static int a_popen_scan_mode(char const *mode
, int *omode
);
87 static void register_file(FILE *fp
, int omode
, int pid
,
88 int flags
, char const *realfile
, long offset
,
89 char const *save_cmd
, struct termios
*tiosp
,
91 static enum okay
_file_save(struct fp
*fpp
);
92 static int a_popen_file_load(int flags
, int infd
, int outfd
,
93 char const *load_cmd
);
94 static enum okay
unregister_file(FILE *fp
, struct termios
**tiosp
,
96 static int file_pid(FILE *fp
);
98 /* TODO Rather temporary: deal with job control with FD_PASS */
99 static void a_popen_jobsigs_up(void);
100 static void a_popen_jobsigs_down(void);
101 static void a_popen_jobsig(int sig
);
104 static void a_popen_sigchld(int signo
);
106 static struct child
*a_popen_child_find(int pid
, bool_t create
);
107 static void a_popen_child_del(struct child
*cp
);
110 a_popen_scan_mode(char const *mode
, int *omode
){
116 {"w", O_WRONLY
| O_CREAT
| n_O_NOXY_BITS
| O_TRUNC
},
117 {"wx", O_WRONLY
| O_CREAT
| O_EXCL
},
118 {"a", O_WRONLY
| O_APPEND
| O_CREAT
| n_O_NOXY_BITS
},
119 {"a+", O_RDWR
| O_APPEND
| O_CREAT
| n_O_NOXY_BITS
},
121 {"w+", O_RDWR
| O_CREAT
| O_EXCL
}
126 for(i
= 0; UICMP(z
, i
, <, n_NELEM(maps
)); ++i
)
127 if(!strcmp(maps
[i
].mode
, mode
)){
128 *omode
= maps
[i
].omode
;
133 DBG( n_alert(_("Internal error: bad stdio open mode %s"), mode
); )
134 n_err_no
= n_ERR_INVAL
;
135 *omode
= 0; /* (silence CC) */
143 register_file(FILE *fp
, int omode
, int pid
, int flags
,
144 char const *realfile
, long offset
, char const *save_cmd
,
145 struct termios
*tiosp
, n_sighdl_t osigint
)
150 assert(!(flags
& FP_UNLINK
) || realfile
!= NULL
);
151 assert(!(flags
& FP_TERMIOS
) || tiosp
!= NULL
);
153 fpp
= smalloc(sizeof *fpp
);
159 fpp
->realfile
= (realfile
!= NULL
) ? sstrdup(realfile
) : NULL
;
160 fpp
->save_cmd
= (save_cmd
!= NULL
) ? sstrdup(save_cmd
) : NULL
;
161 fpp
->fp_tios
= tiosp
;
162 fpp
->fp_osigint
= osigint
;
163 fpp
->offset
= offset
;
169 _file_save(struct fp
*fpp
)
176 if (fpp
->omode
== O_RDONLY
) {
185 /* Ensure the I/O library doesn't optimize the fseek(3) away! */
186 if(!n_real_seek(fpp
->fp
, fpp
->offset
, SEEK_SET
)){
188 n_err(_("Fatal: cannot restore file position and save %s: %s\n"),
189 n_shexp_quote_cp(fpp
->realfile
, FAL0
), n_err_to_doc(outfd
));
194 if ((fpp
->flags
& FP_MASK
) == FP_IMAP
) {
195 rv
= imap_append(fpp
->realfile
, fpp
->fp
, fpp
->offset
);
200 if ((fpp
->flags
& FP_MASK
) == FP_MAILDIR
) {
201 rv
= maildir_append(fpp
->realfile
, fpp
->fp
, fpp
->offset
);
205 outfd
= open(fpp
->realfile
,
206 ((fpp
->omode
| O_CREAT
| (fpp
->omode
& O_APPEND
? 0 : O_TRUNC
) |
207 n_O_NOXY_BITS
) & ~O_EXCL
), 0666);
210 n_err(_("Fatal: cannot create %s: %s\n"),
211 n_shexp_quote_cp(fpp
->realfile
, FAL0
), n_err_to_doc(outfd
));
216 switch(fpp
->flags
& FP_MASK
){
218 if(n_poption
& n_PO_D_V
)
219 n_err(_("Using `filetype' handler %s to save %s\n"),
220 n_shexp_quote_cp(fpp
->save_cmd
, FAL0
),
221 n_shexp_quote_cp(fpp
->realfile
, FAL0
));
222 cmd
[0] = ok_vlook(SHELL
);
224 cmd
[2] = fpp
->save_cmd
;
231 if (n_child_run(cmd
[0], 0, fileno(fpp
->fp
), outfd
,
232 cmd
[1], cmd
[2], NULL
, NULL
, NULL
) >= 0)
242 a_popen_file_load(int flags
, int infd
, int outfd
, char const *load_cmd
){
248 switch(flags
& FP_MASK
){
254 cmd
[0] = ok_vlook(SHELL
);
264 rv
= n_child_run(cmd
[0], 0, infd
, outfd
, cmd
[1], cmd
[2], NULL
, NULL
, NULL
);
271 unregister_file(FILE *fp
, struct termios
**tiosp
, n_sighdl_t
*osigint
)
280 for (pp
= &fp_head
; (p
= *pp
) != NULL
; pp
= &p
->link
)
282 switch (p
->flags
& FP_MASK
) {
290 if ((p
->flags
& FP_UNLINK
) && unlink(p
->realfile
))
294 if (p
->save_cmd
!= NULL
)
296 if (p
->realfile
!= NULL
)
298 if (p
->flags
& FP_TERMIOS
) {
301 *osigint
= p
->fp_osigint
;
308 DBGOR(n_panic
, n_alert
)(_("Invalid file pointer"));
323 for (p
= fp_head
; p
; p
= p
->link
)
333 a_popen_jobsigs_up(void){
339 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
340 a_popen_otstp
= safe_signal(SIGTSTP
, &a_popen_jobsig
);
341 a_popen_ottin
= safe_signal(SIGTTIN
, &a_popen_jobsig
);
342 a_popen_ottou
= safe_signal(SIGTTOU
, &a_popen_jobsig
);
344 /* This assumes oset contains nothing but SIGCHLD, so to say */
345 sigdelset(&oset
, SIGTSTP
);
346 sigdelset(&oset
, SIGTTIN
);
347 sigdelset(&oset
, SIGTTOU
);
348 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
353 a_popen_jobsigs_down(void){
359 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
360 safe_signal(SIGTSTP
, a_popen_otstp
);
361 safe_signal(SIGTTIN
, a_popen_ottin
);
362 safe_signal(SIGTTOU
, a_popen_ottou
);
364 sigaddset(&oset
, SIGTSTP
);
365 sigaddset(&oset
, SIGTTIN
);
366 sigaddset(&oset
, SIGTTOU
);
367 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
372 a_popen_jobsig(int sig
){
373 sighandler_type oldact
;
376 NYD_X
; /* Signal handler */
378 hadsig
= (a_popen_hadsig
!= 0);
381 n_TERMCAP_SUSPEND(TRU1
);
383 oldact
= safe_signal(sig
, SIG_DFL
);
386 sigaddset(&nset
, sig
);
387 sigprocmask(SIG_UNBLOCK
, &nset
, NULL
);
389 sigprocmask(SIG_BLOCK
, &nset
, NULL
);
391 safe_signal(sig
, oldact
);
395 a_popen_sigchld(int signo
){
399 NYD_X
; /* Signal handler */
403 pid
= waitpid(-1, &status
, WNOHANG
);
405 if (pid
== -1 && n_err_no
== n_ERR_INTR
)
410 if ((cp
= a_popen_child_find(pid
, FAL0
)) != NULL
) {
413 cp
->pid
= -1; /* XXX Was _delchild(cp);# */
421 static struct child
*
422 a_popen_child_find(int pid
, bool_t create
){
423 struct child
**cpp
, *cp
;
426 for(cpp
= &_popen_child
; (cp
= *cpp
) != NULL
&& cp
->pid
!= pid
;
430 if(cp
== NULL
&& create
)
431 (*cpp
= cp
= scalloc(1, sizeof *cp
))->pid
= pid
;
437 a_popen_child_del(struct child
*cp
){
449 if(*(cpp
= &(*cpp
)->link
) == NULL
){
450 DBG( n_err("! a_popen_child_del(): implementation error\n"); )
458 n_child_manager_start(void)
460 struct sigaction nact
, oact
;
463 nact
.sa_handler
= &a_popen_sigchld
;
464 sigemptyset(&nact
.sa_mask
);
465 nact
.sa_flags
= SA_RESTART
470 if (sigaction(SIGCHLD
, &nact
, &oact
) != 0)
471 n_panic(_("Cannot install signal handler for child process management"));
476 safe_fopen(char const *file
, char const *oflags
, int *xflags
)
480 NYD2_ENTER
; /* (only for Fopen() and once in go.c) */
482 if (a_popen_scan_mode(oflags
, &osflags
) < 0)
484 osflags
|= _O_CLOEXEC
;
488 if ((fd
= open(file
, osflags
, 0666)) == -1)
492 fp
= fdopen(fd
, oflags
);
499 Fopen(char const *file
, char const *oflags
)
505 if ((fp
= safe_fopen(file
, oflags
, &osflags
)) != NULL
)
506 register_file(fp
, osflags
, 0, FP_RAW
, NULL
, 0L, NULL
, NULL
,NULL
);
512 Fdopen(int fd
, char const *oflags
, bool_t nocloexec
)
518 a_popen_scan_mode(oflags
, &osflags
);
520 osflags
|= _O_CLOEXEC
; /* Ensured to be set by caller as documented! */
522 if ((fp
= fdopen(fd
, oflags
)) != NULL
)
523 register_file(fp
, osflags
, 0, FP_RAW
, NULL
, 0L, NULL
, NULL
,NULL
);
534 if (unregister_file(fp
, NULL
, NULL
) == OKAY
)
539 return (i
== 3 ? 0 : EOF
);
543 n_fopen_any(char const *file
, char const *oflags
, /* TODO should take flags */
544 enum n_fopen_state
*fs_or_null
){ /* TODO as bits, return state */
545 /* TODO Support file locking upon open time */
549 int osflags
, flags
, omode
, infd
;
550 char const *cload
, *csave
;
551 enum n_fopen_state fs
;
556 fs
= n_FOPEN_STATE_NONE
;
557 cload
= csave
= NULL
;
559 if(a_popen_scan_mode(oflags
, &osflags
) < 0)
563 rof
= OF_RDWR
| OF_UNLINK
;
564 if(osflags
& O_APPEND
)
566 omode
= (osflags
== O_RDONLY
) ? R_OK
: R_OK
| W_OK
;
568 /* We don't want to find mbox.bz2 when doing "copy * mbox", but only for
569 * "file mbox", so don't try hooks when writing */
570 p
= which_protocol(csave
= file
, TRU1
, ((omode
& W_OK
) == 0), &file
);
571 fs
= (enum n_fopen_state
)p
;
579 osflags
= O_RDWR
| O_APPEND
| O_CREAT
| n_O_NOXY_BITS
;
583 n_err_no
= n_ERR_OPNOTSUPP
;
586 case n_PROTO_MAILDIR
:
587 if(fs_or_null
!= NULL
&& !access(file
, F_OK
))
588 fs
|= n_FOPEN_STATE_EXISTS
;
590 osflags
= O_RDWR
| O_APPEND
| O_CREAT
| n_O_NOXY_BITS
;
594 struct n_file_type ft
;
596 if(!(osflags
& O_EXCL
) && fs_or_null
!= NULL
&& !access(file
, F_OK
))
597 fs
|= n_FOPEN_STATE_EXISTS
;
599 if(n_filetype_exists(&ft
, file
)){
601 cload
= ft
.ft_load_dat
;
602 csave
= ft
.ft_save_dat
;
603 /* Cause truncation for compressor/hook output files */
604 osflags
&= ~O_APPEND
;
606 if((infd
= open(file
, (omode
& W_OK
? O_RDWR
: O_RDONLY
))) != -1){
607 fs
|= n_FOPEN_STATE_EXISTS
;
608 if(n_poption
& n_PO_D_V
)
609 n_err(_("Using `filetype' handler %s to load %s\n"),
610 n_shexp_quote_cp(cload
, FAL0
), n_shexp_quote_cp(file
, FAL0
));
611 }else if(!(osflags
& O_CREAT
) || n_err_no
!= n_ERR_NOENT
)
615 rv
= Fopen(file
, oflags
);
616 if((osflags
& O_EXCL
) && rv
== NULL
)
617 fs
|= n_FOPEN_STATE_EXISTS
;
623 /* Note rv is not yet register_file()d, fclose() it in error path! */
624 if((rv
= Ftmp(NULL
, "fopenany", rof
)) == NULL
){
625 n_perr(_("tmpfile"), 0);
629 if(flags
& (FP_IMAP
| FP_MAILDIR
))
632 if(a_popen_file_load(flags
, infd
, fileno(rv
), cload
) < 0){
642 if((infd
= creat(file
, 0666)) == -1){
653 if(!(osflags
& O_APPEND
))
655 if((offset
= ftell(rv
)) == -1){
661 register_file(rv
, osflags
, 0, flags
, file
, offset
, csave
, NULL
,NULL
);
663 if(fs_or_null
!= NULL
)
670 Ftmp(char **fn
, char const *namehint
, enum oflags oflags
)
672 /* The 8 is arbitrary but leaves room for a six character suffix (the
673 * POSIX minimum path length is 14, though we don't check that XXX).
674 * 8 should be more than sufficient given that we use base64url encoding
675 * for our random string */
676 enum {_RANDCHARS
= 8u};
679 size_t maxname
, xlen
, i
;
686 assert(namehint
!= NULL
);
687 assert((oflags
& OF_WRONLY
) || (oflags
& OF_RDWR
));
688 assert(!(oflags
& OF_RDONLY
));
689 assert(!(oflags
& OF_REGISTER_UNLINK
) || (oflags
& OF_REGISTER
));
694 tmpdir
= ok_vlook(TMPDIR
);
699 if ((pc
= pathconf(tmpdir
, _PC_NAME_MAX
)) != -1)
700 maxname
= (size_t)pc
;
704 if ((oflags
& OF_SUFFIX
) && *namehint
!= '\0') {
705 if ((xlen
= strlen(namehint
)) > maxname
- _RANDCHARS
) {
706 n_err_no
= n_ERR_NAMETOOLONG
;
712 /* Prepare the template string once, then iterate over the random range */
714 cp
= smalloc(strlen(tmpdir
) + 1 + maxname
+1);
715 cp
= sstpcpy(cp
, tmpdir
);
718 char *x
= sstpcpy(cp
, VAL_UAGENT
);
720 if (!(oflags
& OF_SUFFIX
))
721 x
= sstpcpy(x
, namehint
);
723 i
= PTR2SIZE(x
- cp
);
724 if (i
> maxname
- xlen
- _RANDCHARS
) {
725 size_t j
= maxname
- xlen
- _RANDCHARS
;
729 if ((oflags
& OF_SUFFIX
) && xlen
> 0)
730 memcpy(x
+ _RANDCHARS
, namehint
, xlen
);
732 x
[xlen
+ _RANDCHARS
] = '\0';
736 osoflags
= O_CREAT
| O_EXCL
| _O_CLOEXEC
;
737 osoflags
|= (oflags
& OF_WRONLY
) ? O_WRONLY
: O_RDWR
;
738 if (oflags
& OF_APPEND
)
739 osoflags
|= O_APPEND
;
741 for(relesigs
= TRU1
, i
= 0;; ++i
){
742 memcpy(cp
, n_random_create_cp(_RANDCHARS
, NULL
), _RANDCHARS
);
746 if((fd
= open(cp_base
, osoflags
, 0600)) != -1){
750 if(i
>= FTMP_OPEN_TRIES
){
757 if (oflags
& OF_REGISTER
) {
758 char const *osflags
= (oflags
& OF_RDWR
? "w+" : "w");
761 a_popen_scan_mode(osflags
, &osflagbits
); /* TODO osoflags&xy ?!!? */
762 if ((fp
= fdopen(fd
, osflags
)) != NULL
)
763 register_file(fp
, osflagbits
| _O_CLOEXEC
, 0,
764 (FP_RAW
| (oflags
& OF_REGISTER_UNLINK
? FP_UNLINK
: 0)),
765 cp_base
, 0L, NULL
, NULL
,NULL
);
767 fp
= fdopen(fd
, (oflags
& OF_RDWR
? "w+" : "w"));
769 if (fp
== NULL
|| (oflags
& OF_UNLINK
)) {
773 }else if(fp
!= NULL
){
774 /* We will succeed and keep the file around for further usage, likely
775 * another stream will be opened for pure reading purposes (this is true
776 * at the time of this writing. A restrictive umask(2) settings may have
777 * turned the path inaccessible, so ensure it may be read at least!
778 * TODO once ok_vlook() can return an integer, look up *umask* first! */
779 (void)fchmod(fd
, S_IWUSR
| S_IRUSR
);
787 if (relesigs
&& (fp
== NULL
|| !(oflags
& OF_HOLDSIGS
)))
794 if ((cp
= cp_base
) != NULL
)
800 Ftmp_release(char **fn
)
816 Ftmp_free(char **fn
) /* TODO DROP: OF_REGISTER_FREEPATH! */
829 pipe_cloexec(int fd
[2]){
836 if(pipe2(fd
, O_CLOEXEC
) != -1)
840 n_fd_cloexec_set(fd
[0]);
841 n_fd_cloexec_set(fd
[1]);
850 Popen(char const *cmd
, char const *mode
, char const *sh
,
851 char const **env_addon
, int newfd1
)
853 int p
[2], myside
, hisside
, fd0
, fd1
, pid
;
857 struct termios
*tiosp
;
861 /* First clean up child structures */
863 struct child
**cpp
, *cp
;
866 for (cpp
= &_popen_child
; *cpp
!= NULL
;) {
867 if ((*cpp
)->pid
== -1) {
879 n_UNINIT(osigint
, SIG_ERR
);
880 mod
[0] = '0', mod
[1] = '\0';
882 if (!pipe_cloexec(p
))
887 fd0
= n_CHILD_FD_PASS
;
888 hisside
= fd1
= p
[WRITE
];
890 } else if (*mode
== 'W') {
892 hisside
= fd0
= p
[READ
];
897 hisside
= fd0
= p
[READ
];
898 fd1
= n_CHILD_FD_PASS
;
902 /* In interactive mode both STDIN and STDOUT point to the terminal. If we
903 * pass through the TTY restore terminal attributes after pipe returns.
904 * XXX It shouldn't matter which FD we actually use in this case */
905 if ((n_psonce
& n_PSO_INTERACTIVE
) && (fd0
== n_CHILD_FD_PASS
||
906 fd1
== n_CHILD_FD_PASS
)) {
907 osigint
= n_signal(SIGINT
, SIG_IGN
);
908 tiosp
= smalloc(sizeof *tiosp
);
909 tcgetattr(STDIN_FILENO
, tiosp
);
910 n_TERMCAP_SUSPEND(TRU1
);
915 if (cmd
== (char*)-1) {
916 if ((pid
= n_child_fork()) == -1)
917 n_perr(_("fork"), 0);
919 union {char const *ccp
; int (*ptf
)(void); int es
;} u
;
920 n_child_prepare(&nset
, fd0
, fd1
);
923 /* TODO should close all other open FDs except stds and reset memory */
924 /* Standard I/O drives me insane! All we need is a sync operation
925 * that causes n_stdin to forget about any read buffer it may have.
926 * We cannot use fflush(3), this works with Musl and Solaris, but not
927 * with GlibC. (For at least pipes.) We cannot use fdreopen(),
928 * because this function does not exist! Luckily (!!!) we only use
929 * n_stdin not stdin in our child, otherwise all bets were off!
930 * TODO (Unless we would fiddle around with FILE* directly:
931 * TODO #ifdef __GLIBC__
932 * TODO n_stdin->_IO_read_ptr = n_stdin->_IO_read_end;
934 * TODO n_stdin->_r = 0;
935 * TODO #elif n_OS_SOLARIS || n_OS_SUNOS
936 * TODO n_stdin->_cnt = 0;
938 * TODO ) which should have additional config test for sure! */
939 n_stdin
= fdopen(STDIN_FILENO
, "r");
940 /*n_stdout = fdopen(STDOUT_FILENO, "w");*/
941 /*n_stderr = fdopen(STDERR_FILENO, "w");*/
947 } else if (sh
== NULL
) {
948 pid
= n_child_start(cmd
, &nset
, fd0
, fd1
, NULL
, NULL
, NULL
, env_addon
);
950 pid
= n_child_start(sh
, &nset
, fd0
, fd1
, "-c", cmd
, NULL
, env_addon
);
958 if ((rv
= fdopen(myside
, mod
)) != NULL
)
959 register_file(rv
, 0, pid
,
960 (tiosp
== NULL
? FP_PIPE
: FP_PIPE
| FP_TERMIOS
),
961 NULL
, 0L, NULL
, tiosp
, osigint
);
965 if(rv
== NULL
&& tiosp
!= NULL
){
966 n_TERMCAP_RESUME(TRU1
);
967 tcsetattr(STDIN_FILENO
, TCSAFLUSH
, tiosp
);
969 n_signal(SIGINT
, osigint
);
976 Pclose(FILE *ptr
, bool_t dowait
)
979 struct termios
*tiosp
;
988 unregister_file(ptr
, &tiosp
, &osigint
);
993 rv
= n_child_wait(pid
, NULL
);
995 n_TERMCAP_RESUME(TRU1
);
996 tcsetattr(STDIN_FILENO
, TCSAFLUSH
, tiosp
);
997 n_signal(SIGINT
, osigint
);
1013 n_psignal(FILE *fp
, int sig
){
1017 if((rv
= file_pid(fp
)) >= 0){
1020 if((cp
= a_popen_child_find(rv
, FAL0
)) != NULL
){
1021 if((rv
= kill(rv
, sig
)) != 0)
1033 char const *env_add
[2], *pager
;
1037 assert(n_psonce
& n_PSO_INTERACTIVE
);
1039 pager
= n_pager_get(env_add
+ 0);
1042 if ((rv
= Popen(pager
, "w", NULL
, env_add
, n_CHILD_FD_PASS
)) == NULL
)
1049 n_pager_close(FILE *fp
)
1055 sh
= safe_signal(SIGPIPE
, SIG_IGN
);
1056 rv
= Pclose(fp
, TRU1
);
1057 safe_signal(SIGPIPE
, sh
);
1063 close_all_files(void)
1066 while (fp_head
!= NULL
)
1067 if ((fp_head
->flags
& FP_MASK
) == FP_PIPE
)
1068 Pclose(fp_head
->fp
, TRU1
);
1070 Fclose(fp_head
->fp
);
1074 /* TODO The entire n_child_ series should be replaced with an object, but
1075 * TODO at least have carrier arguments. We anyway need a command manager
1076 * TODO that keeps track and knows how to handle job control ++++! */
1079 n_child_run(char const *cmd
, sigset_t
*mask_or_null
, int infd
, int outfd
,
1080 char const *a0_or_null
, char const *a1_or_null
, char const *a2_or_null
,
1081 char const **env_addon_or_null
, int *wait_status_or_null
)
1083 sigset_t nset
, oset
;
1084 sighandler_type soldint
;
1086 enum {a_NONE
= 0, a_INTIGN
= 1<<0, a_TTY
= 1<<1} f
;
1090 n_UNINIT(soldint
, SIG_ERR
);
1092 /* TODO Of course this is a joke given that during a "p*" the PAGER may
1093 * TODO be up and running while we play around like this... but i guess
1094 * TODO this can't be helped at all unless we perform complete and true
1095 * TODO process group separation and ensure we don't deadlock us out
1096 * TODO via TTY jobcontrol signal storms (could this really happen?).
1097 * TODO Or have a built-in pager. Or query any necessity BEFORE we start
1098 * TODO any action, and shall we find we need to run programs dump it
1099 * TODO all into a temporary file which is then passed through to the
1100 * TODO PAGER. Ugh. That still won't help for "needsterminal" anyway */
1101 if(infd
== n_CHILD_FD_PASS
|| outfd
== n_CHILD_FD_PASS
){
1102 soldint
= safe_signal(SIGINT
, SIG_IGN
);
1105 if(n_psonce
& n_PSO_INTERACTIVE
){
1107 tcgetattr((n_psonce
& n_PSO_TTYIN
? STDIN_FILENO
: STDOUT_FILENO
),
1109 n_TERMCAP_SUSPEND(FAL0
);
1111 sigdelset(&nset
, SIGCHLD
);
1112 sigdelset(&nset
, SIGINT
);
1113 /* sigdelset(&nset, SIGPIPE); TODO would need a handler */
1114 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
1116 a_popen_jobsigs_up();
1120 if((rv
= n_child_start(cmd
, mask_or_null
, infd
, outfd
, a0_or_null
,
1121 a1_or_null
, a2_or_null
, env_addon_or_null
)) < 0){
1128 if(n_child_wait(rv
, &ws
))
1130 else if(wait_status_or_null
== NULL
|| !WIFEXITED(ws
)){
1131 if(ok_blook(bsdcompat
) || ok_blook(bsdmsgs
))
1132 n_err(_("Fatal error in process\n"));
1136 if(wait_status_or_null
!= NULL
)
1137 *wait_status_or_null
= ws
;
1141 a_popen_jobsigs_down();
1142 n_TERMCAP_RESUME(a_popen_hadsig
? TRU1
: FAL0
);
1143 tcsetattr(((n_psonce
& n_PSO_TTYIN
) ? STDIN_FILENO
: STDOUT_FILENO
),
1144 ((n_psonce
& n_PSO_TTYIN
) ? TCSAFLUSH
: TCSADRAIN
), &a_popen_tios
);
1145 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
1148 if(soldint
!= SIG_IGN
)
1149 safe_signal(SIGINT
, soldint
);
1159 n_child_start(char const *cmd
, sigset_t
*mask_or_null
, int infd
, int outfd
,
1160 char const *a0_or_null
, char const *a1_or_null
, char const *a2_or_null
,
1161 char const **env_addon_or_null
)
1166 if ((rv
= n_child_fork()) == -1) {
1168 n_perr(_("fork"), 0);
1171 } else if (rv
== 0) {
1175 if (env_addon_or_null
!= NULL
) {
1176 extern char **environ
;
1177 size_t ei
, ei_orig
, ai
, ai_orig
;
1180 /* TODO note we don't check the POSIX limit:
1181 * the total space used to store the environment and the arguments to
1182 * the process is limited to {ARG_MAX} bytes */
1183 for (ei
= 0; environ
[ei
] != NULL
; ++ei
)
1186 for (ai
= 0; env_addon_or_null
[ai
] != NULL
; ++ai
)
1189 env
= ac_alloc(sizeof(*env
) * (ei
+ ai
+1));
1190 memcpy(env
, environ
, sizeof(*env
) * ei
);
1192 /* Replace all those keys that yet exist */
1194 char const *ee
, *kvs
;
1197 ee
= env_addon_or_null
[ai
];
1198 kvs
= strchr(ee
, '=');
1199 assert(kvs
!= NULL
);
1200 kl
= PTR2SIZE(kvs
- ee
);
1202 for (ei
= ei_orig
; ei
-- > 0;) {
1203 char const *ekvs
= strchr(env
[ei
], '=');
1204 if (ekvs
!= NULL
&& kl
== PTR2SIZE(ekvs
- env
[ei
]) &&
1205 !memcmp(ee
, env
[ei
], kl
)) {
1206 env
[ei
] = n_UNCONST(ee
);
1207 env_addon_or_null
[ai
] = NULL
;
1213 /* And append the rest */
1214 for (ei
= ei_orig
, ai
= ai_orig
; ai
-- > 0;)
1215 if (env_addon_or_null
[ai
] != NULL
)
1216 env
[ei
++] = n_UNCONST(env_addon_or_null
[ai
]);
1222 i
= (int)getrawlist(TRU1
, argv
, n_NELEM(argv
), cmd
, strlen(cmd
));
1224 if ((argv
[i
++] = n_UNCONST(a0_or_null
)) != NULL
&&
1225 (argv
[i
++] = n_UNCONST(a1_or_null
)) != NULL
&&
1226 (argv
[i
++] = n_UNCONST(a2_or_null
)) != NULL
)
1228 n_child_prepare(mask_or_null
, infd
, outfd
);
1229 execvp(argv
[0], argv
);
1239 /* Strictly speaking we should do so in the waitpid(2) case too, but since
1240 * we explicitly waitpid(2) on the pid if just the structure exists, which
1241 * n_child_wait() does in the parent, all is fine */
1242 #if n_SIGSUSPEND_NOT_WAITPID
1243 sigset_t nset
, oset
;
1249 #if n_SIGSUSPEND_NOT_WAITPID
1251 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
1254 cp
= a_popen_child_find(0, TRU1
);
1256 if((cp
->pid
= pid
= fork()) == -1){
1257 a_popen_child_del(cp
);
1258 n_perr(_("fork"), 0);
1261 #if n_SIGSUSPEND_NOT_WAITPID
1262 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
1269 n_child_prepare(sigset_t
*nset_or_null
, int infd
, int outfd
)
1275 /* All file descriptors other than 0, 1, and 2 are supposed to be cloexec */
1276 /* TODO WHAT IS WITH STDERR_FILENO DAMN? */
1277 if ((i
= (infd
== n_CHILD_FD_NULL
)))
1278 infd
= open(n_path_devnull
, O_RDONLY
);
1280 dup2(infd
, STDIN_FILENO
);
1285 if ((i
= (outfd
== n_CHILD_FD_NULL
)))
1286 outfd
= open(n_path_devnull
, O_WRONLY
);
1288 dup2(outfd
, STDOUT_FILENO
);
1293 if (nset_or_null
!= NULL
) {
1294 for (i
= 1; i
< NSIG
; ++i
)
1295 if (sigismember(nset_or_null
, i
))
1296 safe_signal(i
, SIG_IGN
);
1297 if (!sigismember(nset_or_null
, SIGINT
))
1298 safe_signal(SIGINT
, SIG_DFL
);
1302 sigprocmask(SIG_SETMASK
, &fset
, NULL
);
1307 n_child_free(int pid
){
1308 sigset_t nset
, oset
;
1313 sigaddset(&nset
, SIGCHLD
);
1314 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
1316 if((cp
= a_popen_child_find(pid
, FAL0
)) != NULL
){
1318 a_popen_child_del(cp
);
1323 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
1328 n_child_wait(int pid
, int *wait_status_or_null
){
1329 #if !n_SIGSUSPEND_NOT_WAITPID
1338 #if !n_SIGSUSPEND_NOT_WAITPID
1340 sigaddset(&nset
, SIGCHLD
);
1341 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
1344 if((cp
= a_popen_child_find(pid
, FAL0
)) != NULL
){
1345 #if n_SIGSUSPEND_NOT_WAITPID
1347 sigdelset(&nset
, SIGCHLD
);
1349 sigsuspend(&nset
); /* TODO we should allow more than SIGCHLD!! */
1352 waitpid(pid
, &ws
, 0);
1354 a_popen_child_del(cp
);
1358 #if !n_SIGSUSPEND_NOT_WAITPID
1359 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
1362 if(wait_status_or_null
!= NULL
)
1363 *wait_status_or_null
= ws
;
1364 rv
= (WIFEXITED(ws
) && WEXITSTATUS(ws
) == 0);