mirror of
https://github.com/gryf/wmaker.git
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71aa4f2884
- Does away with the O_BINARY abomination - as a byproduct, plugs an fd leak in wcolorpanel.c:fetchFile() - sprinkle some fsync()s to files that have been written to (this needs to be done everywhere) + fix brown paper bag thinko in configure.ac
85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <WINGs/WUtil.h>
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#include "wconfig.h"
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#define RETRY( x ) do { \
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x; \
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} while (errno == EINTR);
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/*
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* copy argc and argv for an existing process identified by `pid'
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* into suitable storage given in ***argv and *argc.
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*
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* subsequent calls use the same static area for argv and argc.
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*
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* returns 0 for failure, in which case argc := 0 and argv := NULL
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* returns 1 for success
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*/
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Bool GetCommandForPid(int pid, char ***argv, int *argc)
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{
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static char buf[_POSIX_ARG_MAX];
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int fd, i, j;
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ssize_t count;
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*argv = NULL;
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*argc = 0;
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/* cmdline is a flattened series of null-terminated strings */
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snprintf(buf, sizeof(buf), "/proc/%d/cmdline", pid);
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while (1) {
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/* not switching this to stdio yet, as this does not need
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* to be portable, and i'm lazy */
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if ((fd = open(buf, O_RDONLY)) != -1)
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break;
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if (errno == EINTR)
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continue;
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return False;
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}
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while (1) {
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if ((count = read(fd, buf, sizeof(buf))) != -1)
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break;
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if (errno == EINTR)
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continue;
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RETRY( close(fd) )
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return False;
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}
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RETRY( close(fd) )
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/* count args */
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for (i = 0; i < count; i++)
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if (buf[i] == '\0')
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(*argc)++;
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if (*argc == 0)
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return False;
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*argv = (char **)wmalloc(sizeof(char *) * (*argc + 1 /* term. null ptr */));
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(*argv)[0] = buf;
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/* go through buf, set argv[$next] to the beginning of each string */
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for (i = 0, j = 1; i < count; i++) {
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if (buf[i] != '\0')
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continue;
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if (i < count - 1)
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(*argv)[j++] = &buf[i + 1];
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if (j == *argc)
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break;
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}
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/* the list of arguments must be terminated by a null pointer */
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(*argv)[j] = NULL;
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return True;
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}
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