| /* Utilities to execute a program in a subprocess (possibly linked by pipes |
| with other subprocesses), and wait for it. |
| Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
| |
| This file is part of the libiberty library. |
| Libiberty is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| Libiberty is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with libiberty; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* This file exports two functions: pexecute and pwait. */ |
| |
| /* This file lives in at least two places: libiberty and gcc. |
| Don't change one without the other. */ |
| |
| #include <stdio.h> |
| #include <errno.h> |
| |
| #ifdef IN_GCC |
| #include "config.h" |
| #include "gansidecl.h" |
| /* ??? Need to find a suitable header file. */ |
| #define PEXECUTE_FIRST 1 |
| #define PEXECUTE_LAST 2 |
| #define PEXECUTE_ONE (PEXECUTE_FIRST + PEXECUTE_LAST) |
| #define PEXECUTE_SEARCH 4 |
| #define PEXECUTE_VERBOSE 8 |
| #else |
| #include "libiberty.h" |
| #endif |
| |
| /* stdin file number. */ |
| #define STDIN_FILE_NO 0 |
| |
| /* stdout file number. */ |
| #define STDOUT_FILE_NO 1 |
| |
| /* value of `pipe': port index for reading. */ |
| #define READ_PORT 0 |
| |
| /* value of `pipe': port index for writing. */ |
| #define WRITE_PORT 1 |
| |
| static char *install_error_msg = "installation problem, cannot exec `%s'"; |
| |
| /* pexecute: execute a program. |
| |
| PROGRAM and ARGV are the arguments to execv/execvp. |
| |
| THIS_PNAME is name of the calling program (i.e. argv[0]). |
| |
| TEMP_BASE is the path name, sans suffix, of a temporary file to use |
| if needed. This is currently only needed for MSDOS ports that don't use |
| GO32 (do any still exist?). Ports that don't need it can pass NULL. |
| |
| (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched |
| (??? It's not clear that GCC passes this flag correctly). |
| (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain. |
| (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain. |
| FIRST_LAST could be simplified to only mark the last of a chain of processes |
| but that requires the caller to always mark the last one (and not give up |
| early if some error occurs). It's more robust to require the caller to |
| mark both ends of the chain. |
| |
| The result is the pid on systems like Unix where we fork/exec and on systems |
| like WIN32 and OS2 where we use spawn. It is up to the caller to wait for |
| the child. |
| |
| The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait |
| for the child here. |
| |
| Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error |
| message with an optional argument (if not needed, ERRMSG_ARG is set to |
| NULL), and -1 is returned. `errno' is available to the caller to use. |
| |
| pwait: cover function for wait. |
| |
| PID is the process id of the task to wait for. |
| STATUS is the `status' argument to wait. |
| FLAGS is currently unused (allows future enhancement without breaking |
| upward compatibility). Pass 0 for now. |
| |
| The result is the pid of the child reaped, |
| or -1 for failure (errno says why). |
| |
| On systems that don't support waiting for a particular child, PID is |
| ignored. On systems like MSDOS that don't really multitask pwait |
| is just a mechanism to provide a consistent interface for the caller. |
| |
| pfinish: finish generation of script |
| |
| pfinish is necessary for systems like MPW where a script is generated that |
| runs the requested programs. |
| */ |
| |
| #ifdef __MSDOS__ |
| |
| /* MSDOS doesn't multitask, but for the sake of a consistent interface |
| the code behaves like it does. pexecute runs the program, tucks the |
| exit code away, and returns a "pid". pwait must be called to fetch the |
| exit code. */ |
| |
| #include <process.h> |
| |
| /* For communicating information from pexecute to pwait. */ |
| static int last_pid = 0; |
| static int last_status = 0; |
| static int last_reaped = 0; |
| |
| int |
| pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| const char *program; |
| char * const *argv; |
| const char *this_pname; |
| const char *temp_base; |
| char **errmsg_fmt, **errmsg_arg; |
| int flags; |
| { |
| int rc; |
| |
| last_pid++; |
| if (last_pid < 0) |
| last_pid = 1; |
| |
| if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) |
| abort (); |
| |
| #ifdef __GO32__ |
| /* ??? What are the possible return values from spawnv? */ |
| rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); |
| #else |
| char *scmd, *rf; |
| FILE *argfile; |
| int i, el = flags & PEXECUTE_SEARCH ? 4 : 0; |
| |
| scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el); |
| rf = scmd + strlen(program) + 2 + el; |
| sprintf (scmd, "%s%s @%s.gp", program, |
| (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base); |
| argfile = fopen (rf, "w"); |
| if (argfile == 0) |
| { |
| int errno_save = errno; |
| free (scmd); |
| errno = errno_save; |
| *errmsg_fmt = "cannot open `%s.gp'"; |
| *errmsg_arg = temp_base; |
| return -1; |
| } |
| |
| for (i=1; argv[i]; i++) |
| { |
| char *cp; |
| for (cp = argv[i]; *cp; cp++) |
| { |
| if (*cp == '"' || *cp == '\'' || *cp == '\\' || isspace (*cp)) |
| fputc ('\\', argfile); |
| fputc (*cp, argfile); |
| } |
| fputc ('\n', argfile); |
| } |
| fclose (argfile); |
| |
| rc = system (scmd); |
| |
| { |
| int errno_save = errno; |
| remove (rf); |
| free (scmd); |
| errno = errno_save; |
| } |
| #endif |
| |
| if (rc == -1) |
| { |
| *errmsg_fmt = install_error_msg; |
| *errmsg_arg = program; |
| return -1; |
| } |
| |
| /* Tuck the status away for pwait, and return a "pid". */ |
| last_status = rc << 8; |
| return last_pid; |
| } |
| |
| int |
| pwait (pid, status, flags) |
| int pid; |
| int *status; |
| int flags; |
| { |
| /* On MSDOS each pexecute must be followed by it's associated pwait. */ |
| if (pid != last_pid |
| /* Called twice for the same child? */ |
| || pid == last_reaped) |
| { |
| /* ??? ECHILD would be a better choice. Can we use it here? */ |
| errno = EINVAL; |
| return -1; |
| } |
| /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| Needed? */ |
| *status = last_status; |
| last_reaped = last_pid; |
| return last_pid; |
| } |
| |
| #endif /* MSDOS */ |
| |
| #if defined (_WIN32) && !defined (__CYGWIN32__) |
| |
| #include <process.h> |
| extern int _spawnv (); |
| extern int _spawnvp (); |
| |
| /* This is a kludge to get around the Microsoft C spawn functions' propensity |
| to remove the outermost set of double quotes from all arguments. */ |
| |
| const char * const * |
| fix_argv (argvec) |
| char **argvec; |
| { |
| int i; |
| |
| for (i = 1; argvec[i] != 0; i++) |
| { |
| int len, j; |
| char *temp, *newtemp; |
| |
| temp = argvec[i]; |
| len = strlen (temp); |
| for (j = 0; j < len; j++) |
| { |
| if (temp[j] == '"') |
| { |
| newtemp = xmalloc (len + 2); |
| strncpy (newtemp, temp, j); |
| newtemp [j] = '\\'; |
| strncpy (&newtemp [j+1], &temp [j], len-j); |
| newtemp [len+1] = 0; |
| temp = newtemp; |
| len++; |
| j++; |
| } |
| } |
| |
| argvec[i] = temp; |
| } |
| |
| return (const char * const *) argvec; |
| } |
| |
| int |
| pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| const char *program; |
| char * const *argv; |
| const char *this_pname; |
| const char *temp_base; |
| char **errmsg_fmt, **errmsg_arg; |
| int flags; |
| { |
| int pid; |
| |
| if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) |
| abort (); |
| pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv) |
| (_P_NOWAIT, program, fix_argv(argv)); |
| if (pid == -1) |
| { |
| *errmsg_fmt = install_error_msg; |
| *errmsg_arg = program; |
| return -1; |
| } |
| return pid; |
| } |
| |
| int |
| pwait (pid, status, flags) |
| int pid; |
| int *status; |
| int flags; |
| { |
| /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| Needed? */ |
| return _cwait (status, pid, WAIT_CHILD); |
| } |
| |
| #endif /* _WIN32 */ |
| |
| #ifdef OS2 |
| |
| /* ??? Does OS2 have process.h? */ |
| extern int spawnv (); |
| extern int spawnvp (); |
| |
| int |
| pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| const char *program; |
| char * const *argv; |
| const char *this_pname; |
| const char *temp_base; |
| char **errmsg_fmt, **errmsg_arg; |
| int flags; |
| { |
| int pid; |
| |
| if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) |
| abort (); |
| /* ??? Presumably 1 == _P_NOWAIT. */ |
| pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); |
| if (pid == -1) |
| { |
| *errmsg_fmt = install_error_msg; |
| *errmsg_arg = program; |
| return -1; |
| } |
| return pid; |
| } |
| |
| int |
| pwait (pid, status, flags) |
| int pid; |
| int *status; |
| int flags; |
| { |
| /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| Needed? */ |
| int pid = wait (status); |
| return pid; |
| } |
| |
| #endif /* OS2 */ |
| |
| #ifdef MPW |
| |
| /* MPW pexecute doesn't actually run anything; instead, it writes out |
| script commands that, when run, will do the actual executing. |
| |
| For example, in GCC's case, GCC will write out several script commands: |
| |
| cpp ... |
| cc1 ... |
| as ... |
| ld ... |
| |
| and then exit. None of the above programs will have run yet. The task |
| that called GCC will then execute the script and cause cpp,etc. to run. |
| The caller must invoke pfinish before calling exit. This adds |
| the finishing touches to the generated script. */ |
| |
| static int first_time = 1; |
| |
| int |
| pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| const char *program; |
| char * const *argv; |
| const char *this_pname; |
| const char *temp_base; |
| char **errmsg_fmt, **errmsg_arg; |
| int flags; |
| { |
| char tmpprogram[255]; |
| char *cp, *tmpname; |
| int i; |
| |
| mpwify_filename (program, tmpprogram); |
| if (first_time) |
| { |
| printf ("Set Failed 0\n"); |
| first_time = 0; |
| } |
| |
| fputs ("If {Failed} == 0\n", stdout); |
| /* If being verbose, output a copy of the command. It should be |
| accurate enough and escaped enough to be "clickable". */ |
| if (flags & PEXECUTE_VERBOSE) |
| { |
| fputs ("\tEcho ", stdout); |
| fputc ('\'', stdout); |
| fputs (tmpprogram, stdout); |
| fputc ('\'', stdout); |
| fputc (' ', stdout); |
| for (i=1; argv[i]; i++) |
| { |
| fputc ('\'', stdout); |
| /* See if we have an argument that needs fixing. */ |
| if (strchr(argv[i], '/')) |
| { |
| tmpname = xmalloc (256); |
| mpwify_filename (argv[i], tmpname); |
| argv[i] = tmpname; |
| } |
| for (cp = argv[i]; *cp; cp++) |
| { |
| /* Write an Option-d escape char in front of special chars. */ |
| if (strchr("'+", *cp)) |
| fputc ('\266', stdout); |
| fputc (*cp, stdout); |
| } |
| fputc ('\'', stdout); |
| fputc (' ', stdout); |
| } |
| fputs ("\n", stdout); |
| } |
| fputs ("\t", stdout); |
| fputs (tmpprogram, stdout); |
| fputc (' ', stdout); |
| |
| for (i=1; argv[i]; i++) |
| { |
| /* See if we have an argument that needs fixing. */ |
| if (strchr(argv[i], '/')) |
| { |
| tmpname = xmalloc (256); |
| mpwify_filename (argv[i], tmpname); |
| argv[i] = tmpname; |
| } |
| if (strchr (argv[i], ' ')) |
| fputc ('\'', stdout); |
| for (cp = argv[i]; *cp; cp++) |
| { |
| /* Write an Option-d escape char in front of special chars. */ |
| if (strchr("'+", *cp)) |
| fputc ('\266', stdout); |
| fputc (*cp, stdout); |
| } |
| if (strchr (argv[i], ' ')) |
| fputc ('\'', stdout); |
| fputc (' ', stdout); |
| } |
| |
| fputs ("\n", stdout); |
| |
| /* Output commands that arrange to clean up and exit if a failure occurs. |
| We have to be careful to collect the status from the program that was |
| run, rather than some other script command. Also, we don't exit |
| immediately, since necessary cleanups are at the end of the script. */ |
| fputs ("\tSet TmpStatus {Status}\n", stdout); |
| fputs ("\tIf {TmpStatus} != 0\n", stdout); |
| fputs ("\t\tSet Failed {TmpStatus}\n", stdout); |
| fputs ("\tEnd\n", stdout); |
| fputs ("End\n", stdout); |
| |
| /* We're just composing a script, can't fail here. */ |
| return 0; |
| } |
| |
| int |
| pwait (pid, status, flags) |
| int pid; |
| int *status; |
| int flags; |
| { |
| *status = 0; |
| return 0; |
| } |
| |
| /* Write out commands that will exit with the correct error code |
| if something in the script failed. */ |
| |
| void |
| pfinish () |
| { |
| printf ("\tExit \"{Failed}\"\n"); |
| } |
| |
| #endif /* MPW */ |
| |
| /* include for Unix-like environments but not for Dos-like environments */ |
| #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \ |
| && (defined (__CYGWIN32__) || ! defined (_WIN32)) |
| |
| #ifdef VMS |
| #define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \ |
| lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1) |
| #else |
| #ifdef USG |
| #define vfork fork |
| #endif |
| #endif |
| |
| extern int execv (); |
| extern int execvp (); |
| |
| int |
| pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| const char *program; |
| char * const *argv; |
| const char *this_pname; |
| const char *temp_base; |
| char **errmsg_fmt, **errmsg_arg; |
| int flags; |
| { |
| int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv); |
| int pid; |
| int pdes[2]; |
| int input_desc, output_desc; |
| int retries, sleep_interval; |
| /* Pipe waiting from last process, to be used as input for the next one. |
| Value is STDIN_FILE_NO if no pipe is waiting |
| (i.e. the next command is the first of a group). */ |
| static int last_pipe_input; |
| |
| /* If this is the first process, initialize. */ |
| if (flags & PEXECUTE_FIRST) |
| last_pipe_input = STDIN_FILE_NO; |
| |
| input_desc = last_pipe_input; |
| |
| /* If this isn't the last process, make a pipe for its output, |
| and record it as waiting to be the input to the next process. */ |
| if (! (flags & PEXECUTE_LAST)) |
| { |
| if (pipe (pdes) < 0) |
| { |
| *errmsg_fmt = "pipe"; |
| *errmsg_arg = NULL; |
| return -1; |
| } |
| output_desc = pdes[WRITE_PORT]; |
| last_pipe_input = pdes[READ_PORT]; |
| } |
| else |
| { |
| /* Last process. */ |
| output_desc = STDOUT_FILE_NO; |
| last_pipe_input = STDIN_FILE_NO; |
| } |
| |
| /* Fork a subprocess; wait and retry if it fails. */ |
| sleep_interval = 1; |
| for (retries = 0; retries < 4; retries++) |
| { |
| pid = vfork (); |
| if (pid >= 0) |
| break; |
| sleep (sleep_interval); |
| sleep_interval *= 2; |
| } |
| |
| switch (pid) |
| { |
| case -1: |
| { |
| #ifdef vfork |
| *errmsg_fmt = "fork"; |
| #else |
| *errmsg_fmt = "vfork"; |
| #endif |
| *errmsg_arg = NULL; |
| return -1; |
| } |
| |
| case 0: /* child */ |
| /* Move the input and output pipes into place, if necessary. */ |
| if (input_desc != STDIN_FILE_NO) |
| { |
| close (STDIN_FILE_NO); |
| dup (input_desc); |
| close (input_desc); |
| } |
| if (output_desc != STDOUT_FILE_NO) |
| { |
| close (STDOUT_FILE_NO); |
| dup (output_desc); |
| close (output_desc); |
| } |
| |
| /* Close the parent's descs that aren't wanted here. */ |
| if (last_pipe_input != STDIN_FILE_NO) |
| close (last_pipe_input); |
| |
| /* Exec the program. */ |
| (*func) (program, argv); |
| |
| /* Note: Calling fprintf and exit here doesn't seem right for vfork. */ |
| fprintf (stderr, "%s: ", this_pname); |
| fprintf (stderr, install_error_msg, program); |
| #ifdef IN_GCC |
| fprintf (stderr, ": %s\n", my_strerror (errno)); |
| #else |
| fprintf (stderr, ": %s\n", xstrerror (errno)); |
| #endif |
| exit (-1); |
| /* NOTREACHED */ |
| return 0; |
| |
| default: |
| /* In the parent, after forking. |
| Close the descriptors that we made for this child. */ |
| if (input_desc != STDIN_FILE_NO) |
| close (input_desc); |
| if (output_desc != STDOUT_FILE_NO) |
| close (output_desc); |
| |
| /* Return child's process number. */ |
| return pid; |
| } |
| } |
| |
| int |
| pwait (pid, status, flags) |
| int pid; |
| int *status; |
| int flags; |
| { |
| /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| Needed? */ |
| #ifdef VMS |
| pid = waitpid (-1, status, 0); |
| #else |
| pid = wait (status); |
| #endif |
| return pid; |
| } |
| |
| #endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! _WIN32 */ |