cGit-UI for Git Repositories

     5         kx 
     5         kx #ifdef HAVE_CONFIG_H
     5         kx #include <config.h>
     5         kx #endif
     5         kx 
     5         kx #include <stdlib.h>
     5         kx #include <stdio.h>
     5         kx #include <string.h>
     5         kx #include <errno.h>
     5         kx #include <error.h>
     5         kx #include <sys/stat.h>
     5         kx #include <sys/wait.h>
     5         kx #include <stdarg.h>
     5         kx #include <unistd.h>
     5         kx 
     5         kx #include <defs.h>
     5         kx 
     5         kx #include <strbuf.h>
     5         kx #include <system.h>
     5         kx 
     5         kx 
     5         kx #define SYSTEM_ERRMSG_SIZE 4096
     5         kx 
     5         kx void system_error( const char *fmt, ... )
     5         kx {
     5         kx   va_list arg_ptr;
     5         kx   char  buf[SYSTEM_ERRMSG_SIZE];
     5         kx   char  msg[SYSTEM_ERRMSG_SIZE];
     5         kx   char *format = "%s: %s\n";
     5         kx 
     5         kx   va_start( arg_ptr, fmt );
     5         kx 
     5         kx   vsnprintf( msg, SYSTEM_ERRMSG_SIZE, (const void *)fmt, arg_ptr );
     5         kx 
     5         kx   va_end( arg_ptr ); /* Reset variable arguments. */
     5         kx 
     5         kx   snprintf( buf, SYSTEM_ERRMSG_SIZE, format, "system", msg );
     5         kx 
     5         kx   (void)write( STDERR_FILENO, buf, strlen( buf ) );
     5         kx 
     5         kx   exit( 1 );
     5         kx }
     5         kx 
     5         kx system_errfunc system_fatal = system_error;
     5         kx 
     5         kx 
     5         kx static void xexec( const char *cmd )
     5         kx {
     5         kx   char *argv[4];
     5         kx   const char *shell = getenv ("SHELL");
     5         kx 
     5         kx   if( !shell ) shell = "/bin/sh";
     5         kx 
     5         kx   argv[0] = (char *) shell;
     5         kx   argv[1] = (char *) "-c";
     5         kx   argv[2] = (char *) cmd;
     5         kx   argv[3] = NULL;
     5         kx 
     5         kx   execv( shell, argv );
     5         kx 
     5         kx   /******************************************
     5         kx     xexec() is called by child process, and
     5         kx     here child process faced to FATAL error:
     5         kx    */
     5         kx   system_fatal( "Cannot exec '%s'\n", cmd );
     5         kx }
     5         kx 
     5         kx static pid_t xfork( void )
     5         kx {
     5         kx   pid_t p = fork();
     5         kx 
     5         kx   if( p == (pid_t) -1 )
     5         kx   {
     5         kx     system_fatal( "Cannot %s: %s\n", "fork()", strerror( errno ) );
     5         kx   }
     5         kx 
     5         kx   return p;
     5         kx }
     5         kx 
     5         kx pid_t sys_exec_command( struct strbuf *sb, const char *cmd )
     5         kx {
     5         kx   int pipe_fh[2];
     5         kx 
     5         kx   pid_t pid = -1;
     5         kx 
     5         kx   if( sb )
     5         kx   {
     5         kx     if( pipe(pipe_fh ) == -1 )
     5         kx     {
     5         kx       system_fatal( "Cannot create pipe: %s\n", strerror( errno ) );
     5         kx     }
     5         kx   }
     5         kx 
     5         kx   pid = xfork();
     5         kx 
     5         kx   if( pid != 0 )
     5         kx   {
     5         kx     if( sb )
     5         kx     {
     5         kx       ssize_t ret;
     5         kx 
     5         kx       close(pipe_fh[1]);
     5         kx       ret = strbuf_read( sb, pipe_fh[0], 1024 );
     5         kx       if( ret < 0 )
     5         kx         system_fatal( "Cannot read pipe: %s\n", strerror( errno ) );
     5         kx       close(pipe_fh[0]);
     5         kx     }
     5         kx 
     5         kx     return pid;
     5         kx   }
     5         kx 
     5         kx   if( sb )
     5         kx   {
     5         kx     dup2(pipe_fh[1], STDOUT_FILENO);
     5         kx     close(pipe_fh[1]);
     5         kx     close(pipe_fh[0]);
     5         kx   }
     5         kx 
     5         kx   xexec( cmd );
     5         kx   return pid; /* only to avoid compilaton warning */
     5         kx }
     5         kx 
     5         kx /*****************************************************************
     5         kx   sys_wait_command() - Wait for pid.
     5         kx 
     5         kx   Return values:
     5         kx   -------------
     5         kx      0  - SUCCESS
     5         kx    >=1  - status returned by child process
     5         kx     -1  - Child terminated on signal
     5         kx     -2  - Child terminated on unknown reason
     5         kx     -3  - Cannot waitpid: waitpid() retusrs -1
     5         kx 
     5         kx      Error message with SIZE length saved into *ERRMSG buffer.
     5         kx  *****************************************************************/
     5         kx int sys_wait_command( pid_t pid, struct strbuf *errmsg )
     5         kx {
     5         kx   int status;
     5         kx 
     5         kx   if( pid < 0 ) return (pid_t) -1;
     5         kx 
     5         kx   while( waitpid( pid, &status, 0 ) == -1 )
     5         kx     if( errno != EINTR )
     5         kx     {
     5         kx       if( errmsg ) {
     5         kx         strbuf_addf( errmsg, "PID %lu: Cannot %s", (unsigned long)pid, "waitpid" );
     5         kx       }
     5         kx       return (int) -3;
     5         kx     }
     5         kx 
     5         kx   if( WIFEXITED( status ) )
     5         kx   {
     5         kx     if( WEXITSTATUS (status) )
     5         kx     {
     5         kx       if( errmsg ) {
     5         kx         strbuf_addf( errmsg, "PID %lu: Child returned status %d", (unsigned long)pid, WEXITSTATUS( status ) );
     5         kx       }
     5         kx       return (int) WEXITSTATUS( status );
     5         kx     }
     5         kx   }
     5         kx   else if( WIFSIGNALED( status ) )
     5         kx   {
     5         kx     if( errmsg ) {
     5         kx       strbuf_addf( errmsg, "PID %lu: Child terminated on signal %d", (unsigned long)pid, WTERMSIG( status ) );
     5         kx     }
     5         kx     return (int) -1;
     5         kx   }
     5         kx   else
     5         kx   {
     5         kx     if( errmsg ) {
     5         kx       strbuf_addf( errmsg, "PID %lu: Child terminated on unknown reason", (unsigned long)pid );
     5         kx     }
     5         kx     return (int) -2;
     5         kx   }
     5         kx 
     5         kx   return 0;
     5         kx }