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Fix getpwuid_r error handling #3

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Fix getpwuid_r error handling #3

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@ghost ghost commented Aug 21, 2020

from man getpwuid: "In case of error, an error number is returned, and NULL is stored in *result."
So, error returned, NOT -1 and errno.
Example from man:

    if (result == NULL) {
        if (s == 0)
            printf("Not found\n");
        else {
            errno = s;
            perror("getpwnam_r");
        }
        exit(EXIT_FAILURE);
    }

Alex Syrnikov added 2 commits August 21, 2020 21:14
Fix typos in libbutl/path.mxx comments
36ce474
Fix getpwuid_r error handling
84be35f 
from man getpwuid:
"In case of error, an error number is returned, and NULL is stored in *result."
Error returned, NOT -1 and errno.
Example from man:
if (result == NULL) {
    if (s == 0)
        printf("Not found\n");
    else {
        errno = s;
        perror("getpwnam_r");
    }
    exit(EXIT_FAILURE);
}
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