Line data    Source code

       1             : #include "burp.h"
       2             : #include "forkchild.h"
       3             : #include "fzp.h"
       4             : #include "log.h"
       5             : 
       6             : #ifdef HAVE_WIN32
       7             :         // Windows version of forkchild is in src/win32/compat/compat.cpp
       8             : #else
       9             : 
      10           0 : static pid_t do_forkchild(int sin, int sout, int serr,
      11             :         const char *path, char * const argv[])
      12             : {
      13             :         pid_t pid;
      14             : 
      15           0 :         if((pid=fork())<0) return -1;
      16           0 :         else if(!pid)
      17             :         {
      18             :                 int fd;
      19           0 :                 if((sin>=0 && dup2(sin, STDIN_FILENO)<0)
      20           0 :                   || (sout>=0 && dup2(sout, STDOUT_FILENO)<0)
      21           0 :                   || (serr>=0 && dup2(serr, STDERR_FILENO)<0))
      22             :                 {
      23           0 :                         logp("dup2: %s\n", strerror(errno));
      24           0 :                         return -1;
      25             :                 }
      26           0 :                 if(sout>=0) setbuf(stdout, NULL);
      27           0 :                 if(serr>=0) setbuf(stderr, NULL);
      28             :                 /* Close all unused file descriptors before exec.
      29             :                  * FD_SETSIZE is not strictly the highest file descriptor-1,
      30             :                  * but there does not appear to be a sensible way to find out
      31             :                  * the true number, and FD_SETSIZE is a close approximation.
      32             :                  * It would be a bit lame if you could open a file whose
      33             :                  * descriptor could not be included in an fd_set. */
      34           0 :                 for(fd=3; fd<(int)FD_SETSIZE; ++fd) close(fd);
      35           0 :                 if(execv(path, argv))
      36           0 :                         logp("execv %s: %s\n", path, strerror(errno));
      37           0 :                 exit(1);
      38             :         }
      39             :         return pid;
      40             : }
      41             : 
      42           0 : pid_t forkchild(struct fzp **sin, struct fzp **sout, struct fzp **serr,
      43             :         const char *path, char * const argv[])
      44             : {
      45             :         pid_t pid;
      46             :         int sinfds[2];
      47             :         int soutfds[2];
      48             :         int serrfds[2];
      49             : 
      50           0 :         if((sin && pipe(sinfds))
      51           0 :           || (sout && pipe(soutfds))
      52           0 :           || (serr && pipe(serrfds)))
      53             :                 return -1;
      54           0 :         if((sin && !(*sin=fzp_dopen(sinfds[1], "w")))
      55           0 :           || (sout && !(*sout=fzp_dopen(soutfds[0], "r")))
      56           0 :           || (serr && !(*serr=fzp_dopen(serrfds[0], "r"))))
      57             :                 return -1;
      58             :         pid=do_forkchild(sin?sinfds[0]:-1, sout?soutfds[1]:-1,
      59           0 :                 serr?serrfds[1]:-1, path, argv);
      60           0 :         if(sin) close(sinfds[0]);
      61           0 :         if(sout) close(soutfds[1]);
      62           0 :         if(serr) close(serrfds[1]);
      63           0 :         return pid;
      64             : }
      65             : 
      66           0 : pid_t forkchild_fd(int *sin, int *sout, int *serr,
      67             :         const char *path, char * const argv[])
      68             : {
      69             :         pid_t pid;
      70             :         int sinfds[2];
      71             :         int soutfds[2];
      72             :         int serrfds[2];
      73             : 
      74           0 :         if((sin && pipe(sinfds))
      75           0 :           || (sout && pipe(soutfds))
      76           0 :           || (serr && pipe(serrfds)))
      77             :                 return -1;
      78           0 :         if(sin) *sin=sinfds[1];
      79           0 :         if(sout) *sout=soutfds[0];
      80           0 :         if(serr) *serr=serrfds[0];
      81             :         pid=do_forkchild(sin?sinfds[0]:-1, sout?soutfds[1]:-1,
      82           0 :                 serr?serrfds[1]:-1, path, argv);
      83           0 :         if(sin) close(sinfds[0]);
      84           0 :         if(sout) close(soutfds[1]);
      85           0 :         if(serr) close(serrfds[1]);
      86           0 :         return pid;
      87             : }
      88             : 
      89           0 : pid_t forkchild_no_wait(struct fzp **sin, struct fzp **sout, struct fzp **serr,
      90             :         const char *path, char * const argv[])
      91             : {
      92           0 :         return forkchild(sin, sout, serr, path, argv);
      93             : }
      94             : 
      95             : #endif